Automatic toll ticketing system



Feb. 6, 1945. MCDAVITT AUTOMATIC TOLL TICKETING SYSTEM Filed June 27,1942 4 Sheets-Sheet l INVENTOR M B. McDAV/TT 6 6. M

ATTORNEY F eb. 6, 1945.

M. B. M DAVITT AUTOMATIC TOLL TICKETING SYSTEM 4 Sheets-Sheet 5 FiledJune 2'7, 1942 MOM k QR INVENTOR M B. McDAV/TT ATTORNEY 1945- M. B. MDAVITT AUTOMATIC TOLL TICKETING SYSTEM 4 Sheets-Sheet 4 Filed June 27,1942 0 o 0 o a a a 0 0000000000000 INVENTOR M 5. McDAl/IZ' ATTORNEYPatented Feb. 6, 1945 UNITED, STATES PATENT OFFICE AUTOMATIG TOLLTICKETING Marcellus B. M'c'D'avitt, Hartsdale, N. 1 .,:assignor to BellTelephone Laboratories, Incorporated; New York, Y., a corporation of NewYork Application June :27, 1942, Serial the. noise is "Claims.

This inventionrelates to a telephone system and more particularly to asystem in which connections are established to certain ofiices over atandem trunk by selecting the trunk in response to .the dialing of oneor more of the office code digits of a wanted line designation and inwhich it is necessary to secure a record of the office code digitsdialed for controlling the rurther extension of .a connection from thetrunk to the ciiice in which the desired line terminates or for otherpurposes.

In telephone systems of the type in which selector switches arecontrolled by a register sender common to all lines of an originatingoffice in which both the ofiice code digits and numerical digits ofwanted lines are registered in response to dialing "by the callingsubscriber, it is well-known practice when the wanted line terminates ina distant oflice to provide intermediate or tandem ofiices through whichsuch calls are extended to such distant ofiic'es. 'Such tandem ofiice isprovided with trunks incoming from originating offices which terminatein selector switches having access to trunks outgoing to such distantofiices and with tandem senders accessible from the tandem trunks whichare capable of controlling selector switches to extend aconnection'ifrom a tandem trunk to a desired distant oilice and for setting selector switches in the selected distant 'ofii'ce to complete theconnection. The t-andem trunk is selected by the setting of selectorswitches in response to the registration of the office code digits of awanted line which terminates in the distant office whereupon the tandemtrunk seizes an idle tandem sender and the originating sender trans-:fers all of its digit registrations including the office code andnumerical digit'regis-trations of the wanted line number to registers"of the tandem sender. 'I'h'e tandem sender then proceeds-to controlselector switchestoextend a connection from the tandem trunk to theenice of the wanted line 'in accordance with the office code digitregistrations transferred thereto from the originating sender and tocontrol selector switches in the selectedoffice in accordance with thenumerical digit registrations transierre thereto from the originatingsender.

When, however, it becomes desirable to provide tandem oflice equipmentof the type above described in telephone systems which have no commonsenders in the originating offices and in which the selector switchesare of the type which are =controlled in their selective movementsdirectly under the control of the calling subscribers dial, it becomesnecessary when a tandem trunk is selected b y the :settingo-f suchselector switches in response to the dialing of the office code digitsor -'-a Wanted line terminating a distant once "he reached overthetandem trunk, to provlde-means-iior ascertain me the ofiice code digitswhich have been dialed so that a sender may "register 's'uch digits foruse in further extending the connection from the tandem trunk to suchwanted .ofiice.

A specific application or tandem trunking of this character may "bemade, for example, in connection with the extension of short haul 'tollconnections to ofiices in the nearby toll area in which the tandemtrunks areprovided with automatic toll ticket printing facilitieswhereby all such short 'liau'l toll connections'n'iay be establishedautomatically under the control of a calling -subS(':li'lie1""s dial andthe "tollticket may be automatically printed. A system of this type isdisclosed in the cop'ending application or J. w. Gooderham, Serial NO.448,782, i'fi'led June 27., 1942 concurrently herewith. Since forticketing purposes the ticket'printer must be supplied with thedesignations of both the calling "and wanted line, it is furtheressential that the ofiice code digits of thewantediine, dialed "by acalling subs'crib er'to select the tandem trunk *bemade available fortheuse of the' to-l'lticket printer.

It'isthereioretheobject of the present invention to provide facilitiesat a tandem trunk and at the equipment associable therw'ithwhich may, ina simple and accurate manner ascerw tan any office code digits which acalling su'b 'sc'riber may have dialed in setting up a connec tion tothe tandem trunk and which may; in conjunction with an code digit dialedsubsequent to theseizure 'of the trunkmake a record of the entireofiicecode of a wanted line number.

Asjil'lustrated herein a "subscriber desiring a connection to a lineterminating in :an oflice or a nearby toll area, "first-removes'hisreceiver from theswitchhookwhereby an'id'le line finder, paired with afirst selector, is started in search of the calling line and, as soon asthe'lin'e is found,

the usual dial tone is transmitted. I Uponhear- 'ing the dial tone, thesubscriber thenproceeds to dial the ofli'ce code and "numerical digitsof the wantedline number. In response to the dialing of one or moreofthe office code digits'gth'e selec tors of a switching train includingthe first selector are operated to extend a connection from'the callingline to anid'le tandem or 'ai'ltomatic ticket'ing trunk accessible"'irorri sucnlmes of the office in which the calling .lihe terminates.are permitted to estarlisii- .tbll connections b3! dialing, over whichtrunk a connection @niay' be vfurther extended to the office which thewanted. line terminates. I I I .I-mmeiiiatelz, following the seizure ofthe trunk an idle sender common to a plurality of such trunkstisiassociated withthe seized trunk over a trunk :flnder.- Since :adigit dialed by :a calling subscriber might be lost during the time-elapsing between the seizure :of the :trunkand the seizure of an "idlesender, the trunk- :is' provided with a seized by a sender in responseto digit register for registering the digit dialed following the lastcode digit dialed to reach the trunk. The sender is provided withregisters for registering-the remaining digits of the called line numberdialed by a calling subscriber. On calls first selector in response totheidialing of a first ofice code digit. On calls toother ofiices'thetrunk maybe seized by a second selector in re-.

sponse to the dialing of two'oflice code digits.

On calls to still other oificesthe trunk may be seized by a thirdselector in response to the dialing of three office code digits. Inother cases a trunk may be seized in response to the setting of a se-ving trunks' Since a trunk may be seized in response to the dialing ofone, two 'or three code Fig. 3 should be placed to the right of Fig. 2;and Fig. 4 should be placed beneath Fig. 3.

' The line finders I03, I04 and I0 5, the first selectors I06. 101 andI.08,the second selectors H19 and H0, and the third selector Hi may beof to certain offices, the trunk may be seized by a; lithe well-knownstep-by-step type and the selectors may be controlled directly by acalling subscribersidial totestablish local connections or to establisha" connection to an idle automatic ticketing trunk such as trunk H3 orH4 should the subscriber desire a connection to a subthe same trunk mayhave appearances in more digits, the trunk register mayr'egist'er eitherthe second'or third code digit or the thousands numerical digit.

than one bank level of the same selector switch, whereby the trunk maybe seized in response to I the dialing of the'first code digit ofcertain dis- As soon as a first digit has been registered in,

the sender, which digit may be either the third code digit, thethousands numerical digit or the hundreds numerical digit, an idleidentifier is associated with the sender over an identifier-connectorand theidentifier is associated directly establishes a record in theidentifier from which the office code digits dialed to reach the trunkmay be reconstructed and if other code digits have been registered bythe trunk register or by the first register of the sender, suchregistration -or registrations are also transferred to the identifierwherebyfr'om all such data registered in the identifier, a routerelay, isoperated which is instrumental-in furnishing all ofthe'iniormation required by the sender and/the ticketing equipment ofthe trunkconcerning the called line and the manner in which the callfrom the calling :line to the called line shall be: ticketed. 4 w

The invention having "been described' in a gen-v eral manner, referencemay now be had to the following detailed description thereof taken inwhichf 1 I v i Fig. 1 shows schematically, calling lines, line findersand a train of first and 'second and third selector switchesforextendinga connection from ,calling lines to tandem automatic ticketingtrunks, two or which are'illustr'ated and a selector switch-of the typehaving access over a divided bank level to two groups of outgoingtrunks; i

Fig. 2 shows a "rotary out-trunk switch accessible froma trunk incoming,ffrom the divided 3 7 bank level switch and having access to a group oftwenty automatic ticketing trunks; 1

' Fig. 3 shows trunk-identifier connectors over which'controlconductorsfrom groups of automatic ticketing trunks may be extended-to that one ofa plurality of identifiers which has been ticketing trunk; and a r Fig.4 shows such portions of an identifier as are necessary to anunderstanding ofthe present invenfign m .3 For a full disclosure ofthe-present invention,

Fig. 2 should be placed to the right :-of Fig. .1;

5i connection with the accompanying drawings in the seizure of a I tantofiices, in response to the dialing of the first and second code digitsof other ofiices and in response to the dialing of the three code digitsof still other oflices. To simplify the disclosure but two groups oftandem trunks areshown available for serving connections to all olficesin the toll area., In the commercial use of the invention, however, aplurality of groups of trunks would be required to handle the tolltraific, for example, 200'trunks divided into ten main subgroups-oitwenty. trunks each with each such subgroup subdivided into other minorsubgroups of ten trunks eachsome of the groups of trunks would be madeavailable only from bank levels of first selectors, other groups wouldbe madeaccessible,

. only from bank levels of second selectors and still other groups wouldbe made accessible only from bank levels of third selectors. Still othergroups might have branches as disclosed accessible from bank levels ofdifferent selectors and from banks of one or more rotary out trunkswitches. The trunking scheme may therefore be made I quite flexible foraccommodating the trunk groups in accordance with the density'of thetolltrafficto difi'erent portions of the toll area.

The selector switch ,I 12 of Fig. 1 may be of the divided levelstep-by-step type disclosed for example in Patent No. 2,249,067, grantedJuly 15, 1941, to P. W. Wadsworth, and have access over the same banklevel thereof to two groups of trunks terminating in rotary out-trunksecondary switches. One such trunk is schematically shown as H5terminating in the rotary out-trunk switch 200 of Fig. 2. The switchZBflis of the step-bystep type disclosed in Patent 1372365,

' granted October 30, 1923, to Forsberg et al. The

switch 200 is disclosed as having access to branches of trunks of two ofthe minor subgroups including the trunks H3 and H4.

Each ticketing trunk is provided with a sleeve relay such'as relays206,201,108 and 209 connected into the sleeve conductors of each banklevel appearance of a trunk in the banks of'first, second, third anddivided levelswitches which relays are instrumental in establishing codesignaling circuits through the trunk-identifier-con nectors to theidentifier seized to handle the call to enablethe dialed office codedigit of a desired line to be reconstructed.

- Two of the ten trunk-identifier connector cir cuits required toconnect any one; of the 200 ticketing trunks tojthe identifier seized'toi serve a .connection' are 'disclosedrin; Fig. 3.; .Each con,-

necto circuit serves .20 trunks and is provided with a multicontactr layfore h identifier a with a lookout re ayfor each. ident fier- Theidentifier is provided with a group oi ten multicontact relays 400 to409, which serve as a register to which an ofi ce code digit or the thusands it dial into theregister 250 of the ti k ting trunk may be transfrr a group of ten multicontact relays 410 to H9 which serve as aregister to which an office code digit or thousands or hundredsnumerical digit dialed into the first dial pulse receiving register ofthe sender may be transferred and a group of multicontact relay su h. asr lay 420., in l ing a relay for each oi eight possible first selectorlevel appearances of ticketing trunks and a relay for each of the,ossible second selector level appearanc s i trunks whi h relays coopeate with the t unk code e is r re ays 401) to 489 to make a translationof the first code digit dialed to set a If first selector anda secondcode digit dialed to set the register of the trunk or to make atranslation of the first and second code digits dialed to set first ands c d sel t rs and a third cod digit dialed to set. theregister of thetrunk. A furth r oup of mult contact r lays, in ud n r lay .2 is provded,- which r lays, coop r t wit the sender c de re ist r r ay 1 to 9 om a t ansla i n i t e r t tw c d digits as translated by one of thetrunk translator relays, for example, relay 4,2,8 and a third codedigit.dialed into the sender and transferred to the sender code registerrelay M0 to M9. The identifier is also provided with a route relay, suchas relays 423, 424 and 425, for each possible called oflice routeandwith additional relays con trolled thereby to transfer oifice codedigits and other information concern ng the called line to the sender;

To more, clearly set forth the novel features of the invention, it will,be assumed that the call ing subscriber whose substation is. identifiedby the numeral IU Q initiates av call for a toll connection to asubscribers line terminating in an ofiice of the toll area to. which thecalling subwanted line number.

It will first be assumed that the calling subscriber desires aconnection with a line whose directory number is MAR-4345 and that aticketing trunk over which a connection to this office may be extendedmay be reached from the sixth bank level of the first selector I06. Thecalling subscriber upon hearing the dial tone therefore proceeds to dialthe office code letters M, A, R, and the numerical digits 1,3, 4", 5. Inresponse to the dialing; of the first office code letter M, which has anumerical equivalent 6, the first selector IDS-is operated to elevateits brushes to a position opposite its sixth bank level and to then huntover theterminals of this level in search of an idle ticketing trunk. Itwill be as'- sumed that the trunk indicatedby the numeral II 3.is id1eand that therefore when the test brush ofv the selector L06, engagestest terminal: II6 of this trunk, it; will; encounter? no vbusy, ground.

potential thereon and therefore "the "selector switch will seize thetrunk to extenda connece tion from the calling line to the tip andringcon;-

ductors of the trunk. As fully described inithe Gooderham applicationhereinbefore referred to, the trunk proceeds to cause the operation of atrunk finder (not shown) .to associate the trunk with an idle, senderand to establish a circuit from ground at the selector I06 over thesleeve I I] of the trunk through the'lower winding of sleeve relay 206,through the winding of relay 2 I 0 and in parallel therewith over theback contact of re= lay 2H] and throughresistance 209 to battery. Relay2.06 operates from the low resistance bate tery thus supplied, preparesa locking circuit over its upper winding and uppermost front contacts tobattery, short-circuits its lower winding and prepares a codesignalingcircuit to code lead 2I2 as will be later described. The trunk is nowprepared to receive the second code letter A dialed by the subscriberwhich is registered as the digit] by the digit register 25,9 of thetrunk in the manner fully described in theGooderharn applicationhereinbefore referred to.

By the time the second code letter dialed by the calling subscribe-r hasbeen registered by the trunk register, a sender will have beenassociated with the trunk and the dialing circuit will upon thecompletion of the registration of the second code letter be extendedover the brushes-of the trunk finder to. the sender. Therefore when thecalling subscriber dials the third code letter R, which has a numericalvalue of 7, the first dial pulse receiving register of the sender is,vset to register the third code letter. As soon as a digit has beenregistered in the sender, an idle identi-- fier for identifying thecalling line; is associated with the sender and the identifier isinformed through the prior operation of the trunk finder in which maingroup of 1 00 trunks and inwhich ZO-trunk subgroup of such main groupthe calling trunk is located. t

It will be assumed that the first identifier has been taken for use andthat therefore a circuitis: establish d- Which may betraced in part overconductor 3M, through thewinding of lock-out relay 300E, allocated to.the first, identifier andto the trunk-identifier-connector circuithaving ac:-

cess, tothe Nos. 0, and 9 subgroups of the main group of trunks whichthe calling line is assumed to: be located and over; the inner uppernormal contacts of: similar lock-out relays allocated to otheridentifiers to ground. Relay 300F- operates if thetrunkridentifier-connector circuit; is not at thetime being used byanother identifier on another call; locks over its upper inner alternatecontacts to ground; establishes an operating circuit for themulticontact relay 3021? fromground through the winding of such relayover the inner lower front contact of relay 30F, through resistance 303to battery and establishes: a circuit from'batterythrough resistance 304overits middle upper front contact, conductor 305 and thence. overacircuit not disclosed but fullyde scribed in the Gooderham; applicationhereinbe: fore referred to which extends over contacts of theidentifier-connector and trunk finder to: ground through the winding, ofrelay 213 otthe calling trunk. With multicontact relay 3021? of the;trunk-identifier-connector circuit and relay 2I3 of the trunk both,operated, a plurality of control conductors are-extended from the trunkto the identifien It is to be: noted; that: toserve each main groupf10.0 tnunksrfive trunk identifier-conn ctor cit-ecults, of which two aredisclosed inFig.'3 are provided, the connector circuit comprising thelock-out relays 300Fto 300L and the multic'ontact relays 302F to 3021.serving the Nos. and 9 subgroups of trunks or 20 trunks, the connectorcircuit comprising the look-out relays 3IOF to 3IOL and the multicontactrelays 3I2F to 3I 2 Lserving the Nos. 1 and 4 subgroups and the threeother connector circuitslnot' shown) serving, respec- I tively',subgroups 2 and 5, 3 and 6 and 7 and 8. A

similar group of five connector circuits would serve the second maingroup of 100 trunks.

As previously stated a sleeve relay, such as 206, is provided for eachselector level appearance of a trunk and the code leads such as 2 [2associated with any trunk are connected over the contacts of the sleeverelays of all appearances of the par ticular trunk involved whichappearances may be at the bank levels of first, second or third selec-Where the bank appearances are ter-' tors.

minated in rotary out-trunk switches, such as the one shown in Fig. 2,the code leads are con, nected to the bank associated with brush 205 ofsuch switch, over brush 205, over contacts of the sleeve relay, such asrelay 203, of the appearance of the trunk in a level of the dividedlevel selector, such as I I2, and over brush 204 and a terminal of thebank associated therewith. There will thus be a number of code leadsconnected between the contacts of the sleeve relays and thecross-connecting rack 30B associated with the trunk-identifier-connectorcircuit serving the subgroup of 20 I trunks in which such trunk islocated, one lead for each routeappearance of the ticketing trunks ofthe two subgroups servedby the connector circuit- After the operation ofrelays 302F and 2l3 as-previously described, battery applied from theidentifier to conductor 307 is connected over contact'308 of relay 302F,conductorl 2l4, con-; tacts of relay 213, lower contacts of the operateda sleeve relay in the case assumed relay 206, to one of the code leads,for example 2|2 terminating in 1 the cross-connecting rack 306. The codeleads are cross-connected over the rack 306 to con ductors which may beconnected by contacts of an operated connector relay such as 302F tocode leads extending to a cross-connecting rack 426 in the identifier.

The number of code leads, such as 309, extending through the connectorcircuit to the identifier willdepend upon the number of possible routeappearances of the trunk at the banks of selectors. first selectors wereinvolved in ticketing trafilc, there would be a maximum of eight codeleads corresponding with the eight appearances at the 1 first selectors.,In alike manner the maximum of route appearances thatmight occur fromthe bank levels of the second selectors available for ticketing trafiicwould be eight times eight or sixty-four appearances or code leads ifall twodigit codes were involved in outgoing ticketing traffic. Thenumber of route appearances from the banks of third selectors is anindeterminate number depending upon the number of routes involvedthrough the bank levels of the third selectors. The cross-connectionracks 306 and For example if eight of the levels of the ing rack 426 maybe cross-connected to the'wind' ings of route relays, such as 423, or'toa trunk translator relay such as 420 or toa vacantcode relay 421. i I

x As previously stated, the identifier is provided with a route relay,such as 423, 424 and 425 for each called ofiice route, contacts of suchroute I relays being associated with cross-connection racks-428 and 429so as to convey to the sender all of the information relating to thesetting up of the connection to the called office route involved. Theroute relay for a called office will,

in some cases, be operated directly from the code leadover'cross-connection at the rack 420. The route relay 423 is shown soconnected. The. route relay in other cases may require a com bination ofthe information obtained from a code lead and the digit which has beendialed into the trunk before it can be operated. In

such a case the winding of the route relay, as

for example relay 425, is connected to a terminal on connecting rack 430over which it'may be cross-connected to a contact ofone of the trunkcode translator relays such as relay 420. In still other cases the routerelay may require a combination of the information from a code lead, thedigit dialed into the trunk and also the first I digit dialed into thesender to determine its operation. For example, in case the trunkappearance is in the bank of a third selector, it is apparent that theroute relay such as 423 may be operated directly from the code leadsince the subscriber has dialed the entire three digits of the ofhcecode designation which will determine the route relay to be operated.When the trunk appearance is in the bank of a second selector and allthe code digits are required to determine the route, then the code leadwill be cross-connected at the rack 426 to the winding of a trunktrans-- requiredto determine the route, then the code e 316 areassociated withthe trunk-identifier-com' nector circuits so that'thecode leads from the 1 sleeve relays, suchas lead 2! 2, which'areassociated with the same route appearance can be connected together. Theonly code leads brought through the connector circuits are thoserequired for separate routes. The code leads entering the identifier'and terminating on the cross-connectlead of the first selector appearancewill be crossconnected over the rack 426 to the winding of a trunk codetranslator relay, such as relay 420, thereby causing its operation whenbattery is applied over such code lead and through the operation of oneof the trunk code register relays- I 400 to 409, battery will beconnected through resistance 43! to one of ten conductors multipledbefore the contacts of the trunk code translator relays and connectablethrough the operation of one of such translator relays to a terminal ofthe cross-connecting rack-430, cross-connectedto the winding of one ofthesender code translator relays such as 4.2 I, thereby causing theoperation of one of-such translator relays. The sender code registerrelays M0 to 4| 9 are operable over the identifier connector inaccordance with the setting of the first dial impulse receiving registerof the sender and the operation of one of these relays will connectbattery through resistance 432 and over contacts of theoperated relay ofthe sender code translator group, for example relay 42I, and terminalsof the cross-connecting.

the winding Zack 433 to the proper routerelay, for example,-

The functions of the route relay are as follows To inform the senderwhether the called office code has two or three digits; whether arepeater is required at the tandem point and whether the called officecode should be, prefixed by a one or two digit repeater code in settingup the connection to the wanted ofilce; whether the sender relay shouldbe added for those cases where either a six digit or a seven digitnumber may be dialed; to inform the sender as to the number of calledo-flice code digits to be sent out by the sender in setting up a call tothe distant point, since the-ticketing trunk may be a direct trunk ormay terminate at atandem ofiice or at a partial tandem point; to sendthe three ofiice code digits to the sender or to control the sendingofthose digits to the sender when they are registered'in the trunk orsender; to inform-the sender as to whether the firstdigit dialed intothe sender is an ofiice code digit, a thousands or a hundreds digit anddirectly or in conjunction with the calling omce register relays of theidentifier to inform the sender or the trunk or both, whether theticketing of the call should bev cancelled or whether the route shouldbe denied or whether a code has been dialed for which there is noexisting ofiice. Since the present invention is not directly concernedwith most of these functions of the route relay, only those functions ofthe route relay involved in reconstructing the calling ofiice code foruse by the sender will be described herein.

It has been assumed that the trunk II3 has been seized over a bank levelof the first selector I06 in response to the dialing of the first codeletter M, that the second code letter A was registered in the trunkregister and that the third code letter R was registered by the firstregister of the sender; It will be assumed that in response to theoperation of the sleeve relay 206 and relays 2I3 and 3021 the code lead2I2 indicative of a first selector level bank appeara'nce is extendedover contacts 309 of 302F and code lead 3I3 to the cross-connecting rack426 where it' is cross-connected to the winding of trunk code translatorrelay 420, whereupon relay 420 becomes operated in response to theapplication of battery 'to conductor 301. Since the second code letter Adialed by the calling subscriber has a numerical value of 2, the digitregister 250 of the trunk has been advanced to register the digit 2 andafter the operation of relay 3021 of the trunk-identifier-connectorcircuit, the setting of the register is transferred to the identifierand results in the operation of relay 402 (not shown) of the trunk codedigit register comprising relays 400 to 409. Since the third code letterR dialed by calling subscriber has a numerical value of '7, the firstdigit register of the sender has been set to register the digit 7 andsuch registration is transferred to the identifier and results in theoperation of relay 4I'I (not shown) ofthe sender code digit registercomprising relays 4I0 to M9,

With relays 402 and 42.0 operated and assum-- ing that sender codetranslator relay 42I is crossconnected on the rack 430 for operation inresponse thereto, the circuit for relay 421 may be traced from battery,through resistance 43I over the No. 7 contacts of relay 402, over theNo. 2 contacts of the translator relay 420, the strapped terminals ofrack 430 to ground through the winding of translator relay 42 I. a Withrelays 4I'I LEI) and 42l operated and assuming that route relay 424 iscross-connected onthe rack 433 for operation in response thereto, thecircuit for route relay 424 may be traced-from battery throughresistance 432 over the No. 3 contacts of relay 4II (not shown), overthe No. 7 contacts of the operated translator relay MI and the strappedterminals of rack 433 to ground through the winding of route relay 424.Relay 424 is thereupon operated.

It will now be assumed that the subscriber at substation I00 dialed theoffice designation DOW whereby an idle ticketing trunk is reached from abank level of a second selector. the first code letter B dialed resultsin the setting of the brushes of the first selector I06 to a positionopposite the third level of its bank, whereupon the brushes rotate toselect an idle second selector, for example, selector I09. The secondcode letter O dialed" then results in the setting of the brushes of thesecond selector I09 to a'position opposite the sixth level of its bankWhereupon they rotate to select an idle ticketing trunk. It will beassumed that the trunk H3 is thus selected. In response to the dialingof the third code letter W, the register 250 of such trunk is set toregister a digit value 9. With the trunkseized over a second selectorbank terminal, a circuit is established over sleeve conductor II 8 forsleeve relay and in the manner previously described, an idle sender andidentifier are seized and the identifier isass oiated with the callingtrunk through the operation of trunk-identifierconnector relay 302F andtrunk relay 2 I 3. When, thereafter, battery is connected at theidentifier to conductor -I,'a circuit is established over contacts 308,of relay 302E, conductor 2I4, contacts of relay 2I3, the lower contactsof sleeve relay 201, code lead 2I5, across strapped terminals oncross-connecting rack 306, contacts 3I4 of relay 302F and code lead 3I5to a terminal of crossconnecting rack 426.- This terminal is in thisinstance strapped to a terminal connected to the winding of anappropriate one of the trunk code translator relays, such as relay 420,and such translator relay is therefore operated. When thereafter thecode digit 9 is transferred to the identifier, relay 409 of the trunkcode digit register is operated. For convenience in illustration, itwill be assumed that the translator relay 420 has been operated.Therefore upon the operation of relay 409, a circuitis established frombattery through resistance 43'I, over the No. 7 contacts of relay 409,over the No. 9 contacts of relay 420- and thence over strapped terminalsof,

the cross-connecting rack 430 to ground through the winding of routerelay 425 which thereupon operates.

It will again be assumed that the subscriber at substation I00 dialedtheoffice designation FIL whereby an idle ticketing trunk is reachedfrom a bank level of a third selector. In this case the first codeletter F dialed results in thesetting of the brushes of the firstselector I06 to a position opposite; the third level of the its bankwhereupon they rotate to select an idle second selector, for example,selector I09; The second code letter I dialed then results in thesetting of the brushes of the second selector I09 to a position oppositethe fourth level of its bank, whereupon they rotate to selectan idlethird-selector, for example, selector III". The third code digit letterL dialed then results in the setting of the brushes of the thirdselector III opposite the fifth level of its bank, whereupon they rotateto In this case I level.

tacts 308 of relay 302F, conductor 2I4, contacts of relay 2I3, the lowercontacts of sleeve relay.

In the manner previously de- 208, code lead 2I6, across strappedterminals on cross-connecting rack 306, contacts 3" of relay 302F andcode lead 3I8 to a terminal of crossconnecting rack 426. This terminalis in this instance strapped to a terminal directly connected to thewinding of a route relay, for example, route relay 423, which relay istherefore operated.

As before stated, the ticketing trunk may in some cases become seizedover the bank of a rotary out-trunk switch. It will now be assumed thatthe subscriber at substation I has dialed the office code KRA whereby anidle ticketing trunk is reached over a bank level of the selector H2 andover bank terminals of the out-trunk switch 200. In this case the firstcode letter K dialed results in the setting of the brushes of the firstselector I06 to a position opposite the fifth level of its bankwhereupon they rotate to select an idle selector H2 of the divided leveltype. The second code letter R dialed causes the. brushes of selector II2 to be raised to the seventh It will be assumed that the switchisarranged to operate its shaft contacts when the brushes are raised tothis level whereupon the switch shaft is released to its normalposition. The second dialed code letter is therefore absorbed and abrush selection is made as fully disclosed in the Wadsworth patenthereinbefore referred to, whereby upon the dialing of the lastcodeletter A, the brushes are raised to a position opposite the second banklevel and are then roupon the terminals of an idle outgoing or ticketingtrunk. It will be assumed that the switch 200 and other similar switchesare at the time standing on terminals allocated to the ticketing trunk II3.

When therefore the trunk H is seized by the switch H2, a, circuit isestablished from ground at switch H2 over sleeve conductor I20 of trunkH5, over normal contacts of test jack 2II through the upper lowresistance winding of sleeve relay 209, .over brush 203 to batterythrough the winding of relay 2I8 and in parallel therewith over theupper back contact of relay:

2I8 and through resistance 2!!! to battery. A

circuit in parallel with thewinding of relay 2I8 is also establishedover the-upper back contact of relay 209, over the interrupter contactsof magnet 22!], over back contacts of relay 22I to:

battery through the winding of stepping relay 222. Relay 209 operatesbut the winding of relay 222 being shunted by the winding of relay 4 The1 i brushes of switch 200, therefore, remain in en- 2I8 and resistance2I9 does not operate.

gagement with the terminals of trunk H3 and a dialing loop is extendedfrom the calling line'over the established connection including brushes20I It will be asand 202 of witch 200, through the windings of the linerelay (not shown) of trunk H3 to cause the association of a sender withthe trunk and to connect ground toconductor 223 to mark the trunk asbusy. With direct ground connected to conductor 223, relay 2 I8 nowoperates if it has not previously operated, and sleeve rela 209 s heldoperated from ground on conductor 223, over brush 203, over the upperfront contacts and through the lower winding of relay 209 to battery.-This marking ground is also connected over sleeve conductor I tohold theline finder I03 and selector switches I00 and H2 in their operatedpositions.

With direct ground connected to conductor 223', a circuit is establishedover the brush 203 of other switches of the same group as switch 200whose brushes may be in engagement with the terminals'of the same trunkII 3, thence over the upper back contact of the associated sleeve relay,corresponding to relay 209, over the interrupter contacts of thestepping magnet 220 of such switch, contacts of group relay 22!, and tobattery through the winding of the stepping relay 222 of such switch.Relay 222 thereupon operates .in turn causing the operation of theassociated stepping magnet 220 which, upon operating opens the circuitof relay 222. Relay 222 then releases in turn releasing magnet 220. Thusrelay 222 and magnet 220 reciprocally con trol each other to causemagnet 220 to advance the switch brushes step-by-step until an idleoutgoing trunk is encountered, at which time the brush 203 will find nobusy ground and the switch brushes will be arrested in engagement withthe terminals of such idle trunk. In this manner, all out-trunkswitcheswhose brushes are engaged with the terminals of trunk H3 aread.-

vanced to presele'ct other idle ticketing trunks.

Following the seizure of an idle sender and the association of anidle'identifier therewith, the trunk-identifier-connector relay302F andthe trunk relay 2I3 are operated and a circuit is established frombattery connected at the identifier to conductor 301, over contacts 308of relay 3021 conductor 2I4, contacts of relay 2I3, brush 204, the lowercontacts of relay 209, brush 205, code lead 224, across strappedterminals of cross-connecting rack 306, contacts 3I9 of relay codedigits to the sender using five leads for each digit, two out of eachgroup of five leads being'grounded in each case. If allthree code digitswere dialed to reach the trunk as indicated for example by the operationof route rela 423 as previously described, the upper Nos. 1, 2 and 3contacts thereof which are connected to terminals on cross-connectingracks 428and 429 will be cross-connected to the win-dings of relays ofthe first code digit group 440 to 449, of the second code digit group450 to 459 and of the third digit group 460 to 469 for operating relaysof these group corresponding to the three code digits dialed; Each ofthese relays is arranged upon its operation to connect ground to a'pairof terminals in the associated cross=connecting rack. Rack 434 isassociated with the relays of group 440 to 449 and has five terminals inwhich terminate the group 435' of five conductors over I ascaoea whichthe first code digit is transmitted to the sender and to which terminalsthe other pairs"v of terminals of the rack are cross-connected in,

the proper combinations of two for the ten values of the first codedigit; Rack 439 is associated with the relays of group 459 to 459 andhas five terminals in which terminate thegroup 431 of five conductorsover which the second code digit Rack 438 is associated with the relaysof group.

469 to 469 and has'five terminals in which terminate the group 439 offive conductors over which the third code digit istransmitted to thesender and to which terminals the other pairs of terminals of the neckare cross-connected the proper combinations of two for the tenvalue's ofthe third code digit. To reconstruct the dialed office code designationFIL, which resulted thereof i established tobattery through the windingof relay 465 (not shown) of the group 489 to 469 to cause thetransmission'of the third code digit to the'sender. I

If the entire office code cannot be sent from the identifier to thesender by the route relay and the third code digit has been registeredin the trunk and transferred to the trunk code register comprisingrelays 499 to 499,-a route relay such as 425 will be operated aspreviously described and will cause the first code digit to betransmitted under its control through the operation of one of the relaysof the group 449 to 449, the second code digit to be transmitted underits control through the operation of one of the relays of the group 459to 459 and the third code digit to be transmitted underthe control ofone of the trunk code register relays of the group499. to 499. In thecase previously assumed, whenthe calling subscriber dialed the otlicedesignation DOW, the ticketing trunk was seized over a. bank level ofthe second selector and the route relay 425 was operated. In this caseupon the opera- 3 tion of relay 422, a circuit is established over? theupper No. 2 contacts of relay 425 and over a strapping oncross-connection rack 429 through the winding of relay 443 (not shown)of the group 449 to 449 to battery to cause the transmission of thefirst code digit 3 to the sender, a circuit is established over theupper No. 3 contacts, of relay 425and over a strapping oncross-connecting rack 429 through the winding of may- 455 (not shown) ofthe group 459 to 459 to battery to cause the transmission of the secondcode Y digit 6 to the sender and a circuit is established over the upperNo. 4 contactsof relay 425.-.'over a strapping on cross-connection rack428 to battery through the winding of relay 419. Belay 419 uponoperating connects ground over its contacts and the Nos. 1 and 2multiple contacts of the trunk code register relays 499 to 499, the cooperating contacts of which relays terminate in pairs of terminals onthe cross-connecting rack 41! which are cross-connected to the properoombinations of two out or five terminals connected to the conductors ofgroup 439 for the ten values of the third code digit. In the caseassumed trunk code register relay 499 has been operated and consequentlythe digit 9 is transmitted to the sender as the third code digit.

In case the second code digit dialed was registered in the trunk andtransferred to the trunk,

code register relays 499 to 499 and the third code digit dialed wasregistered in the sender and transferred to the sender code registerrelays 4l9 to 4L9 in the manner previously described as when thesubscriber dialed the ofiicedesignation MAR, the operated route relay,as for example, relay 424" would cause the transmission 01' the firstcode. digit to the sender through the opera...

tion of one of the relays of the group 449 to 449 in the mannerpreviously described, the second code digit would be transmitted underthe control of the operated relay of the trunk code register group 499to 499 and the third code digit would be transmitted under the controlof the operatedrelay or the sender code register group 4 H! to 4 I 9. Inthe case assumedwith route relay 424 oper-l ated, when relay 422operates a circuit is established from ground over the upper No. 8contacts of relay 424 over a strapping on cross-connection rack 429through the winding of relay 448 (not shown) of the group 449 to 449 tobattery to cause the transmission of the first code digit 6 to thesender and a circuit is established over the. upper No. 4 contacts ofrelay' 424 over a strapping on cross-connection rack 428 to batterythrough the winding of relay 412. Relay 412 upon operating connectsground over its contacts and the Nos. 3 and 4 multiple contacts of thetrunk code register relays 499 to 499, the correspending contacts ofwhich relays terminate in pairs of terminals on the cross-connectingrack 473 which are cross-connected to the proper com.

binations of the conductors of group 437. for the winding of relay 414.Relay-414 upon operating connects ground over its contacts and theNos 1and 2 multiplecontacts of the sender code register relays 4 l 9 to M9,the cooperating contacts of which relays terminate in pairs of terminalson the cross-connecting rack 415 which are crossconnected to the propercombinations of the conductors of group 439 for the ten values of thethird code digit. In the case assumed sender code register relay 4!!(not shown) has been operated and consequently the digit 'listransmitted to the sender as the third code digit. 4

The identifier will always transfer the digit registered in the trunkcode register comprising relays 499 to 499 to the sender jsince in somecases this digit may be the thousands digit as when the ticketing trunkhas been seized from the third selector level. and the sender will thusrequire this digit in establishing the connection and in transmittinginformation to the ticket printer. Therefore when relay 422 operates,ground is connected over its upper contacts and the Nos. 5 and 6multiple contacts of relays of the group 499 to 499, the cooperatingcontacts of connected to the proper combinations of the conductors ofgroup 411 for the ten values of the digit dialed into the trunk.

: As previously stated, each route relay upon operating performs otherfunctions fully described in the application of Gpoderham hereinbeforereferred to, but since. the performance -of such functions does notdirectly concern the present invention, the apparatus by which they areperformed 5 has not been disclosed nor described herein. 1

" What is claimed is:

1. In a telephone ystem, a, calling line, a train of selector switches,a trunk over which connections may be extended to any one of apluralityof offices having a plurality of branches accessible respectively frombank levels of different switches of said train in response to thedialing of one or more of the ofiice code digits of a wanted linenumber, a relayindividual to each branch of said trunk and operable uponthe seizure of said trunk over said branch, means for registering all ofthe oflice code digits dialed in establishing a connection with anybranch of said trunk, a

plurality of circuits for controlling said register ing means controlledrespectively by said relays, and means operative following the seizureof said trunk to complete that one of said circuits which appertains tothe branch over which said trunk was seized whereby the digits dialed toselect said branch are registered by said registering means.

2. In a telephone system, a calling line, a train of selector switches,a trunk over which connec-'-- tions may be extended to any one of aplurality of offices having a plurality ofbranches accessiblerespectively from bank levels of diiferent switches of said traininresponse to the dialing of one or more of the office code digits of awanted line number, a relay individual to each branch of said trunk andoperable upon the seizure of said trunk over saidbranch, means forregistering all of the ofiice code digits dialed in establishing aconnection with any branch of said trunk, a plurality of circuitsforcontrolling said registering means, each of said circuits including arelay indicative of-a branch of said trunk, and means controlled by anoperated one of said first relays to control the operation of the properone of said latter relays whereby the digits dialed to select said trunkare registered by said registering means.

each one of whichco'nnections may be-extended to a plurality of officesand each of which has trunks and operable upon the seizure of a trunkover that particular branch, means for re istering all of the ofiicecode digits dialed in establishing a connection with any branch of anytrunk, a plurality of circuits for controlling said registering meanseach of said circuits including a a relay indicative-of a differentcalled ofiice route, and means operative upon the operation of one ofsaid first relays to selectively complete a circuit including one ofsaid latter relays whereby the digits dialed to select a trunk areregistered by said registering. means. I 1 5. In a telephone system, a.calling line, a train of selector switches, a plurality of primarytrunks accessible respectively from'the bank levels Iof'selectorswitches of said train in response to the dialing of one or more of theofiice code digits of a wanted linenumber, each primary trunkterminating in a secondary trunk selecting switch, a plurality ofoutgoing trunks to which said secondary switches have common access overeach one of which connections may be extended to a plurality of oflicesand idleone of which are normally preselected for seizure, a relayassociated with each primary trunk and operable upon the seizurethereof,means'for register ing the oflice code digits dialed in establishing aconnection with any one of said outgoing trunks, a plurality ofcircuitsfor controlling said registering means, each of said circuitsincluding a relay indicative of a different called office route, andmeans controlled by the operation of one of said first relays toselectively complete a circuit including one of said latter relayswhereby the digits dialed by a calling subscriber to select a 3. In atelephone system, a calling line, a train of selector switches, aplurality of trunks over each one of which connections may be extendedto a plurality of oifices and each of which has a. connection with anybranch of any trunk, a

plurality of circuits for controlling said register;

ing means and selectively controlled by said relays, and means operativefollowing the seizure of any one of said trunks to complete'that one of"sai'd'cireuits which appertains to the branch over which said trunk wasseized whereby the digits dialed to select said branch are registered bysaid registering means.

primary and-a preselected outgoing trunk areregistered by saidregistering means.

' 6. In a telephone system, a calling line, atrain' of selectorswitches, a plurality of primary trunks accessible respectively from thebank levels of selector switches of said train in response to thedialing of one or more of the office code digits of a wanted linenumber, each primary trunk ter-' minating in a secondary trunk selectingswitch, a plurality of outgoing trunks to which said secondary switcheshave common access over each .one of which connections may be extendedto a plurality ofoffices and idle ones of which are normally preselectedfor seizure, a relay asso- I ciated with each primary trunk and operableun- 4. In a telephone system, a calling line, a train of selectorswitches, a plurality of trunks over I der the control of the outgoingtrunk associated withsuch primary trunk, means for registering theofii'ce code digits dialed in establishing a connection with any one ofsaid outgoing trunks, a plurality of circuits for controlling saidregistering means, each extending over contacts of one ofsaid secondaryswitches and controlled'by the relay associated with such secondaryswitch, each of said circuits beingindicative of a different calledoffice route, and means operative following the seizure of an outgoing,trunk to complete that one of said circuits prepared by an operatedrelay whereby the office code digits dialed by a calling subscriber toselect a primary trunk and a preselected outgoing trunk are registeredby said registering 'means' MARCELLUS s. MCDAVIT'I.

